These classes are responsible for mapping strings to SQL date or time types. These classes are not imported by Tangram.pm, thus they must be explicitly imported via a use directive.

The three typetags rawdate, rawtime and rawdatetime are for mapping strings to SQL date/time types, for databases that differentiate between "dates" and "times". 'Raw' means that Tangram doesn't attempt to interpret the strings, it merely passes them down to DBI.

cookeddatetime is like rawdatetime except that the date is converted from the DBMS format to ISO-8601 in the form :

YYYY-MM-DDTHH:MM:SS

for example:

2004-12-25T13:14:15

Other modules then further cook this ISO date into an object as is the convention for a particular module. This only works with back-ends that allow per-connection settings for the default date format, such as Tangram::Driver::Oracle.

On the way back out, the date is converted back to the DBMS format. This is achieved via vendor-specific functions mentioned in Tangram::Relational.

The persistent fields may be specified either as a hash or as an array of field names.

In the hash form, each entry consists in a field name and an associated option hash. The option hash may contain the following fields:

col

sql

col sets the name of the column used to store the field's value. This field is optional, it defaults to the persistent field name. Override if the field name is not an acceptable SQL column name.

sql sets the SQL type of the column. Used by Schema::deploy() when initializing a database. Defaults to 'VARCHAR(255) NULL' for strings, 'INT NULL' for ints and 'REAL NULL' for reals.

The persistent fields may also be specified as an array of strings, in which case the defaults are used.